add restic integration for doing pod volume backups/restores

Signed-off-by: Steve Kriss <steve@heptio.com>

pkg/controller/backup_deletion_controller.go

@@ -27,6 +27,7 @@ import (
 	arkv1client "github.com/heptio/ark/pkg/generated/clientset/versioned/typed/ark/v1"
 	informers "github.com/heptio/ark/pkg/generated/informers/externalversions/ark/v1"
 	listers "github.com/heptio/ark/pkg/generated/listers/ark/v1"
+	"github.com/heptio/ark/pkg/restic"
 	"github.com/heptio/ark/pkg/util/kube"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
@@ -50,6 +51,8 @@ type backupDeletionController struct {
 	restoreLister             listers.RestoreLister
 	restoreClient             arkv1client.RestoresGetter
 	backupTracker             BackupTracker
+	resticMgr                 restic.RepositoryManager
+	podvolumeBackupLister     listers.PodVolumeBackupLister
 
 	processRequestFunc func(*v1.DeleteBackupRequest) error
 	clock              clock.Clock
@@ -67,6 +70,8 @@ func NewBackupDeletionController(
 	restoreInformer informers.RestoreInformer,
 	restoreClient arkv1client.RestoresGetter,
 	backupTracker BackupTracker,
+	resticMgr restic.RepositoryManager,
+	podvolumeBackupInformer informers.PodVolumeBackupInformer,
 ) Interface {
 	c := &backupDeletionController{
 		genericController:         newGenericController("backup-deletion", logger),
@@ -79,11 +84,18 @@ func NewBackupDeletionController(
 		restoreLister:             restoreInformer.Lister(),
 		restoreClient:             restoreClient,
 		backupTracker:             backupTracker,
-		clock:                     &clock.RealClock{},
+		resticMgr:                 resticMgr,
+		podvolumeBackupLister:     podvolumeBackupInformer.Lister(),
+		clock: &clock.RealClock{},
 	}
 
 	c.syncHandler = c.processQueueItem
-	c.cacheSyncWaiters = append(c.cacheSyncWaiters, deleteBackupRequestInformer.Informer().HasSynced, restoreInformer.Informer().HasSynced)
+	c.cacheSyncWaiters = append(
+		c.cacheSyncWaiters,
+		deleteBackupRequestInformer.Informer().HasSynced,
+		restoreInformer.Informer().HasSynced,
+		podvolumeBackupInformer.Informer().HasSynced,
+	)
 	c.processRequestFunc = c.processRequest
 
 	deleteBackupRequestInformer.Informer().AddEventHandler(
@@ -225,6 +237,18 @@ func (c *backupDeletionController) processRequest(req *v1.DeleteBackupRequest) e
 		}
 	}
 
+	// Try to delete restic snapshots
+	log.Info("Removing restic snapshots")
+	if snapshots, err := restic.GetSnapshotsInBackup(backup, c.podvolumeBackupLister); err != nil {
+		errs = append(errs, err.Error())
+	} else {
+		for _, snapshot := range snapshots {
+			if err := c.resticMgr.Forget(snapshot); err != nil {
+				errs = append(errs, err.Error())
+			}
+		}
+	}
+
 	// Try to delete backup from object storage
 	log.Info("Removing backup from object storage")
 	if err := c.backupService.DeleteBackupDir(c.bucket, backup.Name); err != nil {